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Commitments and Contingencies - Schedule of Reconciliation of Balances of Accrued Shelton Lease Cease-Use Liability (Detail) - Shelton Operating Lease [Member] - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Restructuring Cost and Reserve [Line Items]        
Restructuring reserve, beginning balance $ 515   $ 756  
Charges   $ 1,312   $ 1,312
Rental payments (247) (80) (494) (80)
Interest accretion 8   14  
Restructuring reserve, ending balance $ 276 $ 1,232 $ 276 $ 1,232